Good point about istock. I do get frustrated at some of the rejects I get there and then I see some of the accepted images that have little composition and are hardly stock. Anyway, I am in limbo as far as selling lens. I check the ca comparison with the canon l 70-200 and it's six on one hand and half a dozen on the other. The sigma seems sharper at many levels except at 200mm. Besides in looking closely at CA I see it in pretty much every lens, though some better than others. THe 85 f/1.8 did the trick of no ca and it's not even L. I still am considering selling the mkII and getting a 135L but if I get another wedding job I'd still want a zoom and for the price really the sigma can't be beat. Then again, I could just add the canon 100 macro without doing the other thing. We'll see. Thanks foryour input ultima.